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Reports references to variables that are checked for nullability
in the condition of an <code>if</code> statement or
conditional expression but not used inside that
<code>if</code> statement.
<p>
  Usually this either means that
  the check is unnecessary or that the variable is not referenced inside the
  <code>if</code> statement by mistake.
</p>
<p><b>Example:</b></p>
<pre><code>
  void test(Integer i) {
    if (i != null) { // here 'i' is not used inside 'if' statement
      System.out.println();
    }
  }
</code></pre>
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